I cannot believe no company makes a set of headers for the 2.5L V6.
JDMCRX and I are looking into building some.
His GV with the intake and exhaust really pulls hard. Some headers and a chip of some kind would probably increase by 15-20hp.

They're such a small niche market no one's going to spend the development money on it.  That's the downside of driving a vehicle like this.

Headers are in the works. Collectors are here now ill post pics next month

interested, very interested if it will bolt strait up and still use my stock O2 sensor location.  what are you thinking in the way of price, any guesses?

Well it will not be a straight swap. Due to the fact im going long tubes 30-36" primaries. It will exit on the lower side of the engine, Probly beside the bell housing and will go to 2 2.5" cats on each side. i will move the secondary 02 sensors down stream. Then there will be a Y pipe and a flex joint. I want to try to keep it as short as possible so i can use a Flex joint and a resonator.